CN102763464A - Methods of determining uplink target signal-to-interfernce-and-noise ratios and systems thereof - Google Patents

Methods of determining uplink target signal-to-interfernce-and-noise ratios and systems thereof Download PDF

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CN102763464A
CN102763464A CN2011800076363A CN201180007636A CN102763464A CN 102763464 A CN102763464 A CN 102763464A CN 2011800076363 A CN2011800076363 A CN 2011800076363A CN 201180007636 A CN201180007636 A CN 201180007636A CN 102763464 A CN102763464 A CN 102763464A
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link
sir
sinr
confirm
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CN102763464B (en
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C·F·韦弗
杨飏
A·M·饶
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Alcatel Optical Networks Israel Ltd
Nokia of America Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/247—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter sent by another terminal

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Abstract

Example embodiments are directed to a method of determining an uplink target signal-to-interference-and-noise ratio (SINR). In one embodiment, the method includes determining the uplink target SINR for a user equipment (UE) based on a downlink signal-to-interference ratio (SIR). The downlink SIR is determined based on a channel quality indication (CQI) index received from the user equipment.

Description

Be used for confirming the method and the system thereof of up link echo signal interference-to-noise ratio
Background technology
The typical case, cellular communications networks comprises by coupling of wireless or wired connection and the various communication nodes through dissimilar communication channel accesses.Each communication node comprises the protocol stack that is used to handle the data of sending and receiving based on communication channel.The type that depends on communication system, the operation of various communication nodes can be different with configuration, and different titles is arranged usually.This communication system comprises for example CDMA 2000 (CDMA2000) system and UMTS (UMTS).
UMTS is RFDC and phone standard, and it has described a consensus standard set.UMTS has set forth the consensus standard that is used for the voice-and-data transmission between base station (BS) or Node B (cell site) and mobile or the subscriber equipment (UE).The typical case, the UMTS system comprises a plurality of radio network controllers (RNC).RNC in the UMTS network provide with the GSM/GPRS network in the function of function equivalent of base station controller (BSC).But RNC possibly have further ability, comprises the autonomous management switching that for example need not mobile switching centre (MSC) and service general packet radio service (GPRS) support node (SGSN).Cell site is responsible for air interface and is handled and some radio resource management functions.Cell site in the UMTS network provide with the GSM/GPRS network in the function of function equivalent of base station transceiver (BTS).Cell site typical case and existing GSM base station transceiver (BTS) be in location altogether physically, limits to reduce the cost that UMTS realizes and to minimize planning approval.
Fig. 1 shows the general communication system 100 according to the UMTS protocol operation.With reference to figure 1, communication system 100 can comprise a plurality of cell sites, and like cell site 120,122 and 124, each cell site is served the communication requirement of the UE in their overlay areas separately (like UE 105 and 110).Cell site can be served the overlay area that is called as the sub-district, and can microzonation be divided into a plurality of sectors.For the ease of explaining, the whole overlay area that term cell can refer to be served by cell site or the single sector of cell site.Communication from the cell site to UE is called as forward link or down link.Communication from UE to the cell site is called as reverse link or up link.
Cell site 120,122 and 124 is connected to RNC,, and RNC is connected to MSC/SGSN 140 like RNC 130 and 132.RNC handles specific calling and data processing function, and for example, the aforesaid autonomous management that need not MSC and SGSN is switched.MSC/SGSN 140 handles other elements (for example RNC 130/132 and cell site 120/122/124) in the network or arrives the calling of external network and/or the route of data.In Fig. 1, also show conventional interface Uu, Iub, Iur and Iu between these elements.
Mobile radio station or part power control (FPC) scheme of UE through-put power on the up link of 3GPP LTE standard have been proposed to be used to control.This open loop part control technology proposes to be provided with the UE transmit power spectral density, make can compensating for path loss (comprising shade) a part.When ignoring maximum UE transmit power spectral density (power of each tone), can UE transmit power spectral density (PSD) P be configured to:
P＝-αG+P o (1)
Wherein, P is UE PSD, and α is FPC Alpha, and G is long-term average path gain (unit is dB) and is identical for up link and down link, and P oIt is the PSD reference quantity that sends to UE via downlink signaling.Use FPC,
P o＝I+Γ 1-(1-α)G 0 (2)
Wherein, I is the long-term average received noise-plus-interference density (unit is dBm) of each Physical Resource Block (PRB) bandwidth, Γ 1Be the target SINR (unit is dB) when α equals 1, and G 0Be to be the calibration-gain of unit with dB.
Use problem (1) and (2), implicit target SINR is:
Γ＝Γ 1+(1-α)(G-G 0) (3)
But, in particular case, do not have compensation, and all UE utilizing identical transmit power spectral density (might be maximum power) to send for path loss, this causes very high interference level and very poor cell edge rate capability.In other situation, FPC produces traditional slow power control, and path loss and is utilized identical SINR that all UE are received by full remuneration in this traditional slow power control.This causes very poor spectrum efficiency, but has good peripheral speed.
In order to improve FPC, developed relative path gain (RPG).In RPG, control uplink transmission power based on path loss between UE and the service cell site and the difference between the path loss between UE and the next best neighbor cell website.But RPG takies the air interface overhead of quite big quantity, and need carry out more multiprocessing to UE.Therefore, RPG is not available always.More specifically; UE maybe be only when the path loss between UE and the service cell site surpasses thresholding with the ratio between the path loss between UE and the next best neighbor cell website report once or periodically report, and if this ratio be lower than thresholding then possibly do not report.Therefore, when using RPG, possibly there are a large amount of realization mistakes and air interface overhead.
And, known power control scheme do not have to consider for the actual interference influence of whole other neighbor cell websites with, and need additional overhead.
Summary of the invention
At least one execution mode utilizes the level of the interference that UE produces for its adjacent cells/sectors when confirming to be used for the transmit power spectral density of UE.Therefore, advantage comprises that the variance that makes in the interference profile is littler, throughput is higher or the like.In addition, illustrative embodiments is improved the cell edge data rate through using down link SIR estimating uplink target SINR.
At least one illustrative embodiments provides a kind of method that is used for confirming up link echo signal interference-to-noise ratio (SINR).This method comprises the up link target SINR that at first confirms subscriber equipment (UE) based on down link signal interference ratio (SIR).This down link SIR is based on from the channel quality of this subscriber equipment reception and indicates (CQI) index to confirm.
At least another execution mode provides a kind of system; This system comprises cell site; This cell site is configured to confirm based on down link signal interference ratio (SIR) the up link echo signal interference-to-noise ratio (SINR) of subscriber equipment (UE), wherein confirms this down link SIR based on channel quality indication (CQI) index that receives from this subscriber equipment.
Description of drawings
To more be expressly understood illustrative embodiments according to the hereinafter detailed description with the accompanying drawing.Fig. 1-Fig. 4 representes non-restrictive illustrative execution mode as described herein.
Fig. 1 shows the general communication system according to the UMTS protocol operation;
Fig. 2 shows UE can cause interference in neighbor cell example;
Fig. 3 A shows the known method that is used to generate channel quality indication (CQI) index;
Fig. 3 B shows the method that is used for confirming up link echo signal interference-to-noise ratio (SINR) according to an illustrative embodiments; And
Fig. 4 shows the performance of part down link SIR controlling schemes.
Embodiment
Referring now to accompanying drawing various illustrative embodiments are described more completely, certain exemplary execution mode wherein shown in the drawings.In the accompanying drawings, for the sake of clarity possibly exaggerate the thickness in layer and zone.
Therefore, though illustrative embodiments can have various modifications and interchangeable form, shown their execution mode in the accompanying drawings through the mode of example, and will describe these execution modes in detail at this paper.But should be appreciated that, not be intended to illustrative embodiments is limited to disclosed concrete form that but opposite, illustrative embodiments will contain all modifications, equivalent way and the replacement of the scope that falls into claim.Identical Reference numeral refers to identical element in the description of whole accompanying drawing.
Though be appreciated that this paper can use a technical term first, second or the like various elements are described, these elements should not receive the restriction of these terms.Only use these terms that they are distinguished from each other.For example, can first element be called second element, and similarly, can second element be called first element, and can not break away from the scope of illustrative embodiments.As used herein, term " and/or " comprise one or more items of enumerating of being associated arbitrarily or all combinations.Be appreciated that when element is called as " being connected to " or " being coupled to " another element it can be directly connected to or be coupled to other elements or intermediary element can occur.On the contrary, when element is called as " being directly connected to " or " being directly coupled to " another element, intermediary element does not appear.Should explain in a similar fashion the relation that is used to describe between the element other words (for example " and between " " directly between " relatively, " adjacent " be " direct neighbor " or the like relatively).
Term as used herein is only used for describing the purpose of embodiment, and is not intended to limit illustrative embodiments.As used herein singulative " one ", " one " and " being somebody's turn to do " also are intended to comprise plural form, are not like this only if context is clearly indicated.It is also understood that; When using a technical term " comprising " and/or " comprising " at this paper; The appearance and the interpolation of one or more other characteristics, integral body, step, operation, element, assembly and/or their combination are not still got rid of in the appearance of the characteristic that this terminology states is stated, integral body, step, operation, element and/or assembly.
Be to be further noted that in some interchangeable realizations shown function/action can take place not according to the order shown in the figure.For example, in fact can side by side carry out basically according to two accompanying drawings that continuation mode shows, perhaps sometimes can carry out according to opposite order, this depends on related function/action.
If there is not definition in addition, the employed whole terms of this paper (comprising technology and scientific terminology) have with illustrative embodiments under the identical implication of common sense of those of ordinary skill in field.It is also understood that; Should be to have and the consistent implication of they implications in the context of association area with those terminological interpretations that for example in common dictionary, define; And should not be on the desirable or too formal meaning and explain, only if the clear and definite so definition of this paper.
The algorithm of operating with software or to the data bit among the computer storage and the form of symbolic representation provide the part and corresponding detailed description of illustrative embodiments.To be those of ordinary skill in the art to pass on effectively to other those of ordinary skill of this area the description and the expression of the essence that they work through it for these descriptions and expression.As used herein and as the notion of common employed term algorithm be produce the result that hopes from consistent sequence of steps.Step needs the physical operations of physical quantity.This tittle common but unnecessary have can store, transmit, make up, relatively or the light of operation, the form of electrical or magnetic signal.Confirmed that sometimes in principle for general reason, it is easily that these signals are called bit, value, element, symbol, characteristic, item, numeral or the like.
In the description hereinafter; Illustrative embodiments is described in action and symbolic representation (for example block diagram form) with reference to operation; These operations may be implemented as be used to carry out specific tasks or realize concrete abstract data type, comprise routine, the program module or the functional process of program, object, assembly, data structure or the like, and can use existing hardware to locate to realize at existing network element or Control Node (for example being positioned at scheduler, base station or the Node B at cell site place).This existing hardware can comprise one or more central processing units (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) computer or the like.
But should remember sincerely that all these are associated with suitable physical quantity with similar term, and only are the marks easily that is applied to this tittle.If not concrete in addition statement; Perhaps it is obvious that according to discussing; Term such as " processing " or " calculating " or " calculation " or " confirming " or " demonstration " or the like is meant the action and the process of computer system, perhaps be used for operating the register that is represented as computer system or memory physics, amount of electrons data and it is transformed to the action and the process of the similar electronic computing device that is expressed as other data among this information stores of computer system memory or register or other, transmission or the display device similarly.
Also be appreciated that, the typical case, the scheme that the software of illustrative embodiments is realized is coded on tangible (or record) storage medium, perhaps is implemented on the transmission medium of some types.This tangible storage medium can be magnetic (for example floppy disk or hard disk drive) or light (for example compact disk read-only memory or " CD ROM "), and can be read-only or random access.Similarly, transmission medium can be a twisted-pair feeder to, coaxial cable, optical fiber or other suitable transmission mediums more known in the art.Illustrative embodiments does not receive the restriction of these aspects of any given realization.
As used herein term " subscriber equipment " (UE) can with mobile subscriber, mobile radio station, portable terminal, user, subscriber, wireless terminal and/or distant station synonym, and the long-distance user of the Radio Resource in the cordless communication network can be described.Can term " cell site " be interpreted as any terminal website of one or more cell sites, base station, access point and/or radio communication.Though the current network framework possibly considered the difference between mobile/subscriber equipment and the access point/cell site, illustrative embodiments hereinafter described can be applicable to the so tangible framework of difference usually, like ad hoc and/or grid network framework.The Serving cell website can refer to the cell site when the demand of pre-treatment UE.
To illustrative embodiments be described with reference to the UMTS system shown in Fig. 1.But, be appreciated that illustrative embodiments is not limited to this system or UMTS system.For example, can be in CDMA, WiMax and other network configurations realization example property execution mode.
As stated, open loop FPC problem is directly not consider the interference volume that UE will produce adjacent cells/sectors.For example, Fig. 2 shows a kind of example, and UE possibly produce interference in adjacent cells/sectors (hereinafter is referred to as the sub-district) in this example.In Fig. 2, UE T1 is served by cell site 1, and cell site 2 is produced interference.But, if UE T1 has very strong shadow fading to cell site 2, then compare for the situation that cell site 2 has very little shadow fading with UE T1, should allow UE 1 to send with higher power spectral density.Another example is the situation of non-homogeneous layout, and wherein cell site 2 has much bigger radius of society, in this situation, should allow UE T1 to send with higher power level.
According at least one illustrative embodiments, can confirm up link target SINR based on down link signal interference ratio (SIR).Use down link SIR to confirm that up link target SINR makes that variance in the interference profile is littler and/or throughput is higher.In addition, use down link SIR to confirm that up link target SINR has improved the cell edge data rate.
According at least one illustrative embodiments, use down link SIR to confirm up link target SINR.Down link SIR comprise for the interference effect of whole neighbor cell websites with.Therefore, the Serving cell website need not require UE to send the power information about the neighbor cell website, and the UE power information that need not handle the neighbor cell website is with to the Serving cell site report.
More specifically, can confirm the up link rising contribution (interference effect) of UE m as follows to the neighbor cell website:
R i , m = g i , m γ m g s , m - - - ( 4 )
Wherein, g I, mBe path gain from UE to neighbor cell website i, g S, mBe path gain from UE to Serving cell website s, and γ mBe the up link target SINR of UE m.UE m confirms the power that will send based on downlink path-loss with from the up link target SINR that cell site receives.
Therefore, can confirm the up link rising contribution of UE as follows to all neighbor cell websites:
R m = γ m Σ i ≠ s g i , m g s , m = γ m ( Σ i g i , m - g s , m ) g s , m - - - ( 5 )
This rising contribution receives the restriction of constant R.Can based on peripheral speed, sub-district or sector throughput, target interference level, interference noise (IoT) than with other uplink communication parameters arbitrarily at least one come selectivity constant R.Can be by system operator, confirm constant R through experiment test, distributional condition and/or through SON (self-optimizing network) ability.Therefore, can confirm up link target SINR γ as follows m:
Figure BPA00001595150100082
Wherein,
Figure BPA00001595150100083
is the down link SIR that is used for UE m, supposes to carry out time division duplex (TDD) operation.Therefore, can confirm up link target SINR based on down link SIR.Should be appreciated that illustrative embodiments is not limited to TDD.For example, can be through asking average to declining soon, realization example property execution mode in FDD (FDD), and equation (6) more specifically.
In addition, in the land honeycomb operation, down link SIR is the good approximation of down link SINR normally.More specifically, (confirm) that actual downstream link SIR and (being confirmed by the Serving cell website) are based on the difference very little (1dB or littler magnitude) between the approximate down link SINR of down link SIR by UE.Therefore, down link SIR or approximate down link SINR can be used for estimating uplink target SINR.Therefore, approximate down link SINR can be called as down link SINR or down link SIR, and in whole description, is called as down link SINR throughput.
According to logarithmic form, can equation (6) be converted to:
Γ＝R+Γ D (7)
Wherein, Γ is up link target SINR (unit is dB), Γ DBe down link SIR (unit is dB), and R is identical with as above except unit is dB.R is the percentage of total interference of in up link, being introduced by UE.
Equation (6) and (7) can be called as complete down link SIR situation, to distinguish complete down link SIR and part down link SIR.Complete down link SIR can have bigger sector throughput, is cost with the peripheral speed still.
In another illustrative embodiments at least, can use part down link SIR to confirm up link target SINR based on down link SIR.
As stated, when ignoring the maximum UE transmit power spectral density, provide UE by equation (1) and send spectral density P.For situation, can be set to 1 by FPC Alpha α at the UE place based on part down link SIR.Therefore, can confirm UE PSD P as follows:
P＝-G+P o (8)
And
P o＝I+Γ (9)
Wherein, up link target SINR becomes:
Γ＝Γ 1+(1-β)(Γ D+Γ o)?(10)
Wherein, Γ DBe down link SIR, Γ oBe the constant that is used to calibrate, and Γ 1Be target SINR for β=1.β is a constant, when β is set to 0, gets back to complete down link SIR situation, and when β is set to 1, gets back to constant SINR situation.
Through moving Γ o, system can change AnchorPoint with respect to the distribution of down link SIR.Can optimize Γ o, Γ 1And β, to improve the performance of system.Can select Γ based at least one or both combinations in up link peripheral speed, the sector throughput o, Γ 1And β.
Can be set to 0 through β, and R=Γ is set o+ Γ 1, part down link SIR is transformed into complete down link SIR, wherein R is the percentage that UE strides across total interference that all cell sites cause.
Complete down link SIR is preference sector throughput (STP) rather than the transmission of UE peripheral speed more.Part down link SIR improves the transmission of UE peripheral speed through the value that changes β.
The Serving cell website can indicate (CQI) index to confirm down link SIR according to downlink channel quality.Like what will understand according to the description of hereinafter; Use down link SIR to confirm that as being used for the tolerance of up link target SINR does not need UE to carry out additional treatments; With the interference effect of report from the neighbor cell website; Because down link SIR represent interference effect with, and can confirm according to down link CQI index.At least use down link SINR confirm the CQI index be familiar with those personnel of compatible UE of LTE or base station equipment known.UE implementer can carry out minimum change (1dB or littler magnitude) for the compromise of cost relative performance." Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures, " 3rd Generation Partnership Program, 3GPP TS 36.212, V8.5.0, in December, 2008, that has summarized the CQI index confirms that its full content mode is by reference incorporated this paper into.
Fig. 3 shows the known method S300 that is used to generate down link CQI index.At the S310 place, UE is from Serving cell website receiving downlink signal.For example, UE can be from current service cell website receiving downlink pilot power.Can make this to the magnitude of 200ms according to every separated 100ms and confirm, and on this time interval, ask on average, thereby the influence that declines is soon asked average receiving pilot power.
According to " Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures, " 3rd Generation Partnership Program, 3GPP TS 36.212, V8.5.0, in December, 2008, at the S320 place, UE confirms the CQI index based on the down link signal that receives.UE selects a kind of CQI index, makes that UE can be at " Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures, " 3rd Generation Partnership Program, 3GPP TS 36.212, V8.5.0 communicates by letter with the Serving cell website within the error rate of regulation in 2008 12 months.More specifically, can confirm the CQI index based on down link SINR, channel condition and the modulation that is associated with the CQI index confirmed by UE and at least one in the encoding scheme by UE.Modulation and the next CQI index of communicating by letter of encoding scheme that UE selects permission UE use to be associated with the Serving cell website.
CQI is the numeral from zero to 15.UE confirms the CQI index through the down link SINR of definite down link signal that receives.The method that is used for confirming down link SINR and CQI index can be a known method arbitrarily.After definite down link SINR, UE is mapped to the CQI index with down link SINR with other factors that influence the decoded error rate performance.Be that minimum SINR represented in 1 CQI index, and be that the highest down link SINR represented in 15 CQI index.Each CQI index sign is used for the modulation and the encoding rate scheme of down link.
At S330, UE sends down link CQI index to the Serving cell website.UE can send the CQI index at a distance from 1 millisecond aloft and whenever.
Fig. 3 B shows the method S400 that is used for confirming up link target SINR according to illustrative embodiments.
At S410, the Serving cell website receives the down link CQI index that sends from UE.At S420, the Serving cell website uses this CQI index to confirm down link SINR.More specifically, owing to the LTE standard is programmed in the Serving cell website, so the Serving cell website can use the CQI index to confirm down link SINR.For example, the Serving cell website can use the look-up table that comprises the CQI index that is associated with down link SINR value respectively.Can confirm this look-up table through each modulation that is associated with each CQI index and experimental analysis and/or the detailed emulation of the down link SINR of encoding scheme.After the Serving cell website was confirmed down link SINR, the Serving cell website can use down link SIR and down link SINR with exchanging.Because at the cost sensitivity degree of the downlink power at Serving cell website place usually less than the susceptibility of the UE of up link, so at the off-limits point of up link place, down link is normally interference-limited.Therefore, can use down link SIR and down link SINR with exchanging.
At S430, the Serving cell website is complete down link SIR or part down link SIR according to what use, and up link target SINR is confirmed in user's formula (6), (7) or (10).For example, equation (6) or (7) are used for complete down link SIR, and equation (10) is used for part down link SIR.
After the Serving cell website was confirmed up link target SINR, the Serving cell website can squint with transmission PSD based on up link target SINR and confirm to be used for the MCS level of up link.The Serving cell website can be observed the short term variations at the reception SINR at Serving cell website place, and adjusts this MCS level and how to change to follow the trail of this reception SINR.
The Serving cell website adds up up link target SINR and the total interference plus noise of average, long term, to confirm the PSD skew.The Serving cell website sends the PSD skew with as signaling message at S440 to UE then.UE can measure the average path loss from down link, and skew confirms to send PSD according to PSD.In order to reduce traffic load, the Serving cell website can be periodically or when have very about-face in the PSD skew time, is sent PSD and squint.
Fig. 4 shows the approximate 5MHz LTE up link STP opposite edges speed under IoT control of the up link target SINR based on part down link SIR that is used for based on up link target SINR and the usage example property execution mode of FPC.In Fig. 4, part down link SIR has β=0.5 and FPC operation has α=0.8.Utilization is that the IoT target of unit is come each point of mark with 10dB.As shown in Figure 4, use part down link SIR to confirm that up link target SINR produces better STP opposite edges speed characteristic than FPC.
Use down link SIR to compare with FPC in the sectorized cells, on up link, produce and approximately exceed 30% capacity gain as tolerance.In addition, down link SIR has considered the UE in sector borders.
As stated; Use down link SIR need be from the extra process of UE as the tolerance of up link target SINR; And the air interface of communicating by letter on minizone communication or the sub-district is not increased any expense, because down link SIR confirms according to the CQI index.
So describe exemplary execution mode, can change illustrative embodiments in many ways obviously.This change has not been regarded as deviating from the spirit and the scope of illustrative embodiments, and it is obvious that whole this modifications intentions are included in the scope of claim for those skilled in the art.

Claims (10)

1. one kind is used for the method that up-link power is controlled, and said method comprises:
The up link echo signal interference-to-noise ratio (SINR) of confirming subscriber equipment (UE) based on down link signal interference ratio (SIR) (S430) wherein, is confirmed said down link SIR based on channel quality indication (CQI) index that receives from said subscriber equipment.
2. method according to claim 1 also comprises:
Confirm power spectral density skew (S430) based on determined up link target SINR.
3. method according to claim 2 also comprises:
Send said power spectral density skew (S440) to said UE.
4. method according to claim 1, wherein, confirm that said up link target SINR (S430) confirms said up link target SINR as follows:
Figure FPA00001595150000011
Wherein,
Figure FPA00001595150000012
is said down link SIR, and R is a constant.
5. method according to claim 4, wherein, said definite (S430) comprises the following said down link SIR of confirming:
Wherein, g I, mBe path gain from said UE to neighbor cell website i, and g S, mIt is path gain from said UE to Serving cell website s.
6. method according to claim 1, wherein, said definite (S430) comprises based on definite modulation of said down link SIR and encoding scheme.
7. method according to claim 1, wherein, confirm that said up link target SINR (S430) comprising:
Confirm down link SINR based on said CQI index.
8. method according to claim 7, wherein, confirm that said up link target SINR (S430) comprising:
Confirm said down link SIR based on said down link SINR.
9. method according to claim 1, wherein, confirm that said up link target SINR (S430) confirms said up link target SINR as follows:
Γ＝Γ 1+(1-β)(Γ D+Γ o)
Wherein, Γ DBe said down link SIR, Γ oBe the constant that is used to calibrate, and Γ 1Be target SINR, and β is a constant for β=1.
10. system comprises:
Cell site; Its up link echo signal interference-to-noise ratio (SINR) that is configured to confirm subscriber equipment (UE) based on down link signal interference ratio (SIR) (S430); Wherein, confirm said down link SIR based on channel quality indication (CQI) index that receives from said subscriber equipment.
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